Re: git fetch <remote> <branch> behaves weirdely when run in a worktree

[Junio C Hamano <gitster@pobox.com>]

Duy Nguyen <pclouds@gmail.com> writes:

> On Wed, Sep 26, 2018 at 05:24:14PM +0200, Duy Nguyen wrote:
>> On Wed, Sep 26, 2018 at 6:46 AM Kaartic Sivaraam
>> <kaartic.sivaraam@gmail.com> wrote:
>> > This is the most interesting part of the issue. I **did not** run
>> >'git fetch ...' in between those cat commands. I was surprised by
>> >how the contents of FETCH_HEAD are changing without me spawning any
>> >git processes that might change it. Am I missing something here? As
>> >far as i could remember, there wasn't any IDE running that might
>> >automatically spawn git commands especially in that work
>> >tree. Weird.
>
> Maybe something like this could help track down that rogue "git fetch"
> process (it's definitely _some_ process writing to the wrong file; or
> some file synchronization thingy is going on). You can log more of
> course, but this is where FETCH_HEAD is updated.

Well, a background-ish thing could be some vendor-provided copy of
Git that has nothing to do with what Kaartic would be compiling with
this patch X-<.

> -- 8< --
> diff --git a/builtin/fetch.c b/builtin/fetch.c
> index 0696abfc2a..0dfb580e92 100644
> --- a/builtin/fetch.c
> +++ b/builtin/fetch.c
> @@ -786,6 +786,13 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
>  	if (!fp)
>  		return error_errno(_("cannot open %s"), filename);
>  
> +	{
> +		struct strbuf sb = STRBUF_INIT;
> +		strbuf_addf(&sb, "( date; ls -l /proc/%d/cwd ) >>%s.log", getpid(), filename);
> +		system(sb.buf);
> +		strbuf_release(&sb);
> +	}
> +
>  	if (raw_url)
>  		url = transport_anonymize_url(raw_url);
>  	else
> -- 8< --
>
> --
> Duy